| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of surely preventing damage of a rotor by a simple means also improve accuracy of a screw part. SOLUTION: In a screw driving gear formed by screwing a nut 2 to a screw shaft 3, supporting the nut 2 rotatably to a case 1, and mounting respectively a rotor 5 of a motor in the periphery of this nut 2 and a stator 6 of the motor fixed to the case in the periphery of this rotor 5, the rotor 5 of the motor mounted in the periphery of the nut 2 is secured to the nut by a secured layer 11 formed by synthetic resin, in an external diameter of the nut and/or intenal diameter of the rotor, security reinforced location 13 is provided. |
